bong vs gravity bong

bong

noun
  • A vessel, usually made of glass or ceramic and filled with water, used in smoking various substances; especially marijuana. 

  • A device for rapidly consuming beer, usually consisting of a funnel or reservoir of beer and a length of tubing. 

  • An Australian Aboriginal person. 

  • Doorbell chimes. 

  • A very wide piton. 

  • An act of smoking one serving of drugs from a bong. 

  • The clang of a large bell. 

verb
  • To pull a bell. 

  • To ring a doorbell. 

  • To smoke a bong. 

gravity bong

noun
  • A homemade device used to smoke marijuana, consisting of a plastic jug with the bottom cut out and immersed in a vat of water, which is then raised to create a vacuum beneath its bowl of lit marijuana. 

  • Synonym of waterfall bong 

How often have the words bong and gravity bong occurred in a corpus of books? (source: Google Ngram Viewer )